class Solution:
    def findLUSlength(self, a: str, b: str) -> int:
        # 思路：脑筋急转弯题目
        if a==b :
            return -1
        return max(len(a), len(b))

if __name__ == '__main__':
    print(Solution().findLUSlength('aefawfawfawfaw', 'aefawfeawfwafwaef'))